Starter and regulator for compound motors.



W. H. GAULKE. STARTER AND REGULATOR FOR COMPOUND MQTORS. APPLICATION I-ILED F1236, 1911.

2 SHEETS-SHEET 1.

PatentedNdv. 14, 1911.

W. H. GAULKE. STARTER AND REGULATOR FOR COMPOUND MOTORS. APPLICATION 11,111) FEELS, 1911.

1,008,81 1 Patented Nov. 14,1911.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

WILLIAM H. GAULKE, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO INDEPENDENT ELECTRIC MANUFACTURING COMPANY, A CORPORATION OF WISCONSIN.

Application filed February 6, 1911. Serial No. 606,751.

Specification of Letters Patent.

PatentedNov. 14, 1911.

-nections between the two which provides used.

that the field resistance shall at all times be cut out upon the starting of the motor; secondly, to provide an improved form of magnet-armature for the contact-arm; thirdly, an improved form of contact-segment; and fourthly, to provide an improved mechanical design of arm, which shall be simpler, cheaper and stronger than those heretofore Other objects of the invention will appear from the detailed description which follows. My invention comprises the constructions and combinations which will be hereinafter more specifically'described and set forth in my clalms.

For the better understanding of my in"- vention I have illustrated two approved forms thereof in the accompanying drawings, wherein Figure 1 is a 22 of Fig. 1; Fig. 3 is a perspective view of the speedmegulating arm; Fig. 4 is a perspective view of the magnet-armature; Fig. 5 is a diagram of the electrical connections; Fig. 6 is a face-view of another form of regulator, embodying my improvements; Fig. 7 1s a longitudinal cross-section thereof upon the line 7-7 of Fig. .6; Fig. 8 is a side-view upon a larger scale of one of the contact-segments in situ to illustrate the slightly convex original form thereof; 'Fig. 9 is a perspective view of the contact-segment; Fig. 10 is a similar View of the sliding contact-block; and FigQ'll is a side-view of the starting contact-arm.

The reference letters refer each to the same part in each figure of the drawings.

In the first form of the drawings the startingv and speed-regulating arcs are on opposite sides of the front face of the face-plate, while in the second form theyare disposed.

face-view of a regulator pro- 'vided with my improvements; Fig. 2 is a fragmentary sectional view upon the line.

poles.

one within the other, making a more com-- pact arrangement. Describing first the former, A designates the face-plate secured to the rheostat-casing by screws a, and provided with terminals B, C, D and E for connection with the line, armature, and fieldwires, as indicated by their legends, and connected to the various elements of the apparatus as will hereinafter more particularly appear. U on a pivot-post F mounted upon the plate turn the two contact-arms G and H, the former of which is the starting-arm, and the second the speed-regulating arm. The arm G connects electrically with the contact-segments I, being provided opposite said segments with a movable contact-block J, which is pressed into yielding engagementwith the segments by a bar K, through which passes a post M, upon which is a spring L pressed downwardly upon the bar K by a nut m, as will be more particuscrew terminal 9'. A handle 9 is provided on the outer end of the arm, and beyond this the arm G is rovided with an extension 9 to which is plvotally secured by means'of a headed pin or rivet g a small iron plate N,

which is the armature for the electromagnet O, this latter consisting of a coil 0, an iron core 0 and asupport 0 which has an iron yoke o forming the opposite magnet-pole .to the free end of the core 0 The form of the armature N is shown. more particularly in Fig. 1, and it ,will be armature shown in the copending joint application of-Julius T. Kalweit and myself,- No."570,915, filed July 7, 1910. The plate N is in this instance provided with a pivot-ear n which is centrally locatedbetween the two poles n and 11. the latter being adapted to register with the end of the core 0 and of the yoke o respectively, and as will be seen said pivot-ear n is depressed below the top of the plate so as to bring it as nearly central as possible, and it may be somewhat loose upon its pivot, so as in effect to have a limited free swinging movement in all directions, and thus to bring it into perfect contact and alinement with-thetwo magnet .seen that this is an improved form of the The speed-regulating'arm H as shown comprises a simple plate of spring brass, which is mounted directly beneath the arm G, and therefore maintained in parallel alinement, and the end of which is resiliently depressed upon one of the series of contact-buttons P, which are connected to the successive sections of p of the fieldresistance. The arm H may be provided near its free end with a handle it. The particular feature of novelty with regard to thisarm is its connection with the arm G. At one side of saidarm near its base there is an upstanding lug" k which extends above the left-hand edge of the arm G in the manner shown; so that the two arms cannot be separated by an angle greater than90 degrees. As usual a spring Q, the end of which rests upon a post 9, is employed to return the arm G when released to its starting point, shown in full lines-in Fig. '1, and when so released itcarries with it the arm H in whatever'position the latter may be back to its starting point. This is provided in order that all the field resistance may be cut out at the starting of'the motor without fail, -which,'as is well under-' stood, is essential to the proper operation of motors. Moreover I provide means whereby the arm H cannot be advanced atv I all, until the arm G has been turned up to its terminal position, and all the resistance cut out of the armature,- at which point it may beheld by the magnet- O. Thismeans comprises a spring-clip R secured to the base A'by screws 0" or the like, and illustrated in side-view in Fig. 2. As shown, this clip is formed with a depression or channel r adapted to engage the edges of the arm H and prevent it from-moving;

' and at the left of this channel is an elevated portion? in the'p'roper position to be struck by a projecting portion of the arm G said pro ecting portion being'in this case, "as

illustrated by the dotted-lines, the head on the bottom'of a rivet g and which is used for securing the pieces of the arm together as will be hereinafter described. Vhen the contact-arm .G is advanced to its dottedline position, said projection strikes the convexity T and depresses the clip R to its dotted-line position, thus releasing the handle H, and permitting it to be advanced. To the right of the channel 7' is provided an oblique lip r which-is engaged by the edge of the arm H'in returning to its starting position in order that it may depress the clip and enter the channel T The electrical connections of the apparatus are as shown in Fig. 5, the contact-segments I being connected to the successive segments 71 0f the armature-resistance as usual, except the extreme left-hand section, which is a blank. The armature terminal C is connected by a lead 11 to the right- Loe'sgsz a is provided to limit the counter-clockwise movement of the arm G.

In the second form of the invention a narrow base-plate A takes the place of the base-plate A, and the elements a, B; C, D, E,F, I, J, K, M, N, O,Q,g, Sand 8' are the same and similarly disposed to the first form; but the contact-buttons P for the field-resistance occupy a position concentric with the-segment I as shown, and the speed-regulating arm H has a somewhat diiferent form. In this case no lug If is provided, but instead thereof there is a handle h fixed on an extension at one side of the arm in position to engage the side of the starting-arm G, so that the latter in returning to its starting-position, strikes the handle it and carries with it the arm H.

.'In operation the arm G. is first moved to its full-line positiom'and being held there by the magnet the arm H is next moved up to the position esired to give the required speed. A shoulder 72* may be provided on the side of the arm H to engage the cushion s.

The only difference between the arms G a and G is in the location and position of the armature-plate N. In the arm G the GX- tension 9 andpin 9* are omitted. As will to receive the post F; thus giving axial v rigidity to the arm in a cheap and effective manner. The spacebetween the ends ofthe strips g g is occupied by the spring Xear the other end of the arm the lower strip 9 is ofiset as shown at 9", so as to provide a wide bearing for the block which fits loosely within rectangular apertures 9 formed in both strips. This construction of arm is shown in the aforesaid joint application ofJulius TQKalweit and myself, but is not claimed therein, as it constitutes my sole invention. In the second form of the invention the pivot-ear a of the armature-plate N enters the space between the strip and the oifset g", having a free movement thereim and is pivoted is also as described in my aforesaid joint application, but a with an improvement.

- Said contact-segment comprises a plate of sheet-metal, shown in the side-view in Fig. 8, and perspective in F ig. 9, whose inner end receives the end of a dowel-pin T seated in a recess a in the face-plate A and provided with a spacing-shoulder t. The other end of the plate I is secured bya nut a to the end of a screw-post U, a second nut a of the same thickness as the spacingshoulder t being placed under the plate I to hold it level. Now, I have found that in this'construction as originally described, in

wwhich the plate I was perfectly fiat, the

nut u was insufiicient to keep the bars tight, and the inner ends thereof were apt to rattle to a slight extent,so that the'faces of the contact-segments would not all be perfectly level, but one would rise slightly above the other, and the block J would catch upon the edges thereof and fail to work smoothly. To avoid this difiiculty, according to my present invention I form the segments I very slightly convex, as illustrated by per spective view in Fig. 9, and by the dotted- .lines 2' of Fig. 8, this being done without any extra expense by simply. grinding away' very slightly the edges of the punching die. The convexity thus produced is exaggerated in the drawings to make it visible to theeye, and when the screw it is turned up tight, it will result in depressing the inner end of the plate I, and holding it in tight connectionwith the shoulder 25, while at the same time'bending it substantially fiatas shown. a

'From' the above description it will be vreadily seen that my invention is not limited to special forms and mechanical constructions such as I have hereinabove shown by 1-way of illustration, but that the'principles thereofare expressible in a variety of ways a's iwin be well understood by those skilled.

" in the art; therefore the scope of my claims is to be interpreted tive constructions.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, the

in view of such alternacombination of two coaxially pivoted contact-arms and two sets of contact-segments with which they cooperate, each of said sets beingconnectedto the successive'sections of a resistance, and the terminal end of one resistance being adapted for direct-connection with the armature of an electric motor,-

and the starting end of the other resistance being adapted for direct-connection with the field-thereof; in con un'ction with means for operative engagement between the two arms, whereby the former in returning to' the starting-point carries with it the latter, and the latter cannot be advancedwithout advancing the former.

'2. In a device of the class described, the

combination of two coaxially pivoted contact-arms and two sets of contact-segments with which they cooperate, each of said sets being connected to the successive sections of a resistance, and. the terminal end of one resistance being adapted for direct-connec.

ing to'the starting-point carrieswith it the latter, and the latter is held at its startingpoint until the former has reached. its terminal-point.

3. In a device of the class described, the combination of two coaxially pivoted contact-armsand two sets of contact-segments with which they cooperate, each of said sets being connected to the successive sections of a resistance, and the terminal end of one resistance being adapted for direct-connection with the armature of an electric motor, and the starting end of the other resistance being adapted for direct connection with the field'thereof; and a projection on the second arm which is adapted to be struck by the first in its return movement,-so as to carry the. second with it to the startingpoint.

4:. In. a device of the class described, the combination of two coaxially pivoted contactarrns and two sets of contact-segments withw hich they cooperate, each of said sets .bei-ng vconnected to the successive sections of a resistance, and the terminal end of one resistance being adapted for direct-connection with the armature of an electrlc motor, .and

the starting end of the other resistance being adapted for direct connection with the field thereof; a projection on the second arm which isadapted to be struck by the first in its return movement, so as to carry the second with it to the starting-point, and a retaining-device adapted to engage and hold the second arm in itsistartmg-posltion and to be acted on by the first arm when in its terminal position to withdraw it from said en a ement.

5. In a device of the class described, the I combination of two coaxially pivoted. contact-arms andtwo sets of contact-segments with which they cooperate, each ofsaid sets being connected to the successive sections of a resistance, and the terminal endiiof one resistance being adapted" for direct-connec-- tion with the armature of an electric motor, and the starting end of the other resistance being adapted for direct connection with the field thereof; and a device adapted to engage the second arm and hold it inits starting-position, said device being actuated by the first arm in reaching its terminal position to disengage it from the second arm.

6. In a device of the class described, the combination of two coaxially pivoted contact-arms and two sets of contact-segments with which they cooperate, each of said sets being connected to the successive sections of a resistance, and the terminal end of one resistance being adapted for directconnection with the armature of an electric motor, and the starting end of the other resistance being adapted for direct connection with the field thereof; and a spring-clip adapted to resiliently engage and hold said second arm in its starting position.

7. In a device of the class described, the conabination i two coaxially pivoted contact-arms and two sets of contact-segments with which they cooperate, each of said sets being connected to the successive sections of a resistance, and the terminal end of one resistance being adapted for direct-connection with the armature of an GlBCtliClDOtOl, and the starting end of the other resistance being adapted for direct connection with the field thereof; and a spring-clip adapted to resiliently engage and hold said second arm in its starting position, said springclip having an element adapted to be struck position and depressed thereby, so as to re lease said second arm. a

8. In combination a contact-segment con sisting of a plate having a slight convexity, a face-plate of insulating material, rests for the two ends of said plate, and means for,

clamping one end of said plate down upon. its rest; said clamplng means acting to tiatten out said convexity and thereby hold the opposite ends of said plate in firm contact with its rest.

9. In a device of the class described, in combination, a face-plate having two holes therein, a shouldered dowel-pin fitting in one of said holes, a screw-post in the other hole, a nut on said screw-post next to the face-plate and of the same thickness as the shoulder of said dowel-pin, a metal contactsegment having holes in its ends receiving the end of said dowel-pin and of said screwpost respectively, said contact-plate having normally a slight convexity, and a second nut engaging the threaded end of said screw-post above said contact-segmentand adapted upon drawing up to flatten said convexity and depress the opposite end of the contact'segment upon the shoulder of said dowehpin.

In witness whereof I have hereunto set my hand in the presence of two witnesses. M. H. GAULKE. *itnesses CARL A. ZINX, S. Y. J. 'ABEszwIsKI. 

